Ken drove from Town A to Town B which was 534 km away. He started from Town A at an average speed of 60 km/h. He maintained this speed for 4 h before increasing it by 8 km/h for the rest of the journey to Town B.
- How long did he take to complete the whole journey?
- What was his average speed from Town A to Town B?
(a)
Distance of 1st part of the journey
= 4 x 60
= 240 km
New speed for rest of the journey
= 60 + 8
= 68 km / h
Remaining distance for rest of the journey
= 534 - 240
= 294 km
Time taken for rest of the journey
= 294 ÷ 68
= 2 h
Total time taken
= 4 + 2
= 6 h
(b)
Average speed of the whole journey
= 534 ÷ 6
= 89 km
Answer(s): (a) 6 h; (b) 89km/h